Bluetooth

RFCOMM does not allow to connect a user

sudo chmod u+s /usr/bin/rfcomm

Pairing bluetooth in command line

bluez-simple-agent hci# xx:xx:xx:xx:xx:xx

Replace # with the Bluetooth adapter number (e.g. hci0) and xx:xx:xx:xx:xx:xx with the MAC of our Bluetooth device

To get the number of our adapter

hciconfig 

To get the MAC

hcitool scan

DE-Pairing bluetooth in command line

bluez-simple-agent hci# xx:xx:xx:xx:xx:xx remove

Connect to a bluetooth

rfcomm connect 0 xx:xx:xx:xx:xx:xx

or use rfcomm.conf

More info

http://www.pezzino.ch/serial-port-to-bluetooth-chip-to-pc/